Simon Cowell: Zayn Malik needs to 'keep quiet for a while'

Simon Cowell thinks Zayn Malik needs to take time out from Twitter.

Since quitting One Direction in March, the 22-year-old singer has gotten into spats on the social networking site with producer Naughty Boy, former bandmate Louis Tomlinson and DJ Calvin Harris, and Simon believes Zayn needs to think before he tweets.